This International Standard specifies the terminology and definitions for solid biofuels. According to the scope of the ISO/TC 238 this standard only includes raw and processed material originating from the following sources: 1) forestry and arboriculture; 2) agriculture and horticulture; 3) aquaculture. Raw and processed material includes woody, herbaceous, fruit and aquatic biomass from the aforementioned sectors. Chemically treated material shall not include halogenated organic compounds and heavy metals at levels higher than those in typical virgin material values (refer to ISO document regarding fuel specification and fuel classes, Part 1). Treatment with air, water or heat is not regarded as chemical treatment. Solid biofuels originating from different recycling processes of end-of-life-products are not within the scope but relevant terms are included for information. Areas covered by ISO/TC 28/SC7 "Liquid biofuels" and ISO/TC 193 "Natural gas" are excluded. This International Standard is based on standard EN 14588:2010 as well as on approved national standards and manuals. In this International Standard instead of the legal definition waste the technical terms residue, and byproduct are used to describe co-products from forestry and arboriculture, agriculture and horticulture, and aquaculture as well as related industries. The terms and definitions are harmonized as far as possible with the current language used in management as well as in regulatory activities. This document (EN ISO 16559:2014) has been prepared by Technical Committee ISO/TC 238 "Solid biofuels" in collaboration with Technical Committee CEN/TC 335 "Solid biofuels" the secretariat of which is held by SIS (Sweden). The responsible German body involved in its preparation is Working Committee NA 062-05-82 AA "Biogene Festbrennstoffe" ("Solid biofuels") at DIN Standards Committee Materials Testing (NMP).